Interpolator.h

// -*- C++ -*-
//
// This file is part of LHAPDF
// Copyright (C) 2012-2023 The LHAPDF collaboration (see AUTHORS for details)
//
#pragma once
#ifndef LHAPDF_Interpolator_H
#define LHAPDF_Interpolator_H
 
#include "LHAPDF/Utils.h"
#include "LHAPDF/KnotArray.h"
 
namespace LHAPDF {
 
 
  // Forward declaration
  class GridPDF;
 
 
  class Interpolator {
  public:
 
    virtual ~Interpolator() { }
 
 
 
    void bind(const GridPDF* pdf) { _pdf = pdf; }
 
    void unbind() { _pdf = 0; }
 
    bool hasPDF() { return _pdf != 0; }
 
    const GridPDF& pdf() const { return *_pdf; }
 
 
 
 
    double interpolateXQ(int id, double x, double q) const {
      return interpolateXQ2(id, x, q*q);
    }
 
    double interpolateXQ2(int id, double x, double q2) const;
 
    void interpolateXQ2(double x, double q2, std::vector<double>& ret) const;
 
 
 
    std::string type() const {
      return _type;
    }
 
    void setType(std::string t) {
      _type = t;
    }
 
 
  protected:
 
    virtual double _interpolateXQ2(const KnotArray& grid, double x, size_t ix, double q2, size_t iq2, int id) const = 0;
 
    virtual void _interpolateXQ2(const KnotArray& grid, double x, size_t ix, double q2, size_t iq2, std::vector<double>& ret) const = 0;
 
 
  private:
    const GridPDF* _pdf;
    std::string _type;
  };
 
 
}
 
#endif